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Deprotonation of the methyl-ene group in bis-(3,5-diiso-propyl-pyrazol-1-yl)methane with n BuLi and reaction with carbon dioxide yields lithium bis-(3,5-diiso-propyl-pyrazol-1-yl)acetate ( 1 ). Treatment of 1 with ZnCl 2 results in the com-pound bis-[bis-(3,5-diiso-propyl-pyrazol-1-yl)acetato]-zinc(II), [Zn(C 20 H 31 N 4 O 2 ) 2 ] ( 2 ), whose structure has monoclinic ( P 2 1 / c ) symmetry. The Zn II ion resides on an inversion center and is coordinated by two bis-(3,5-diiso-propyl-pyrazol-1-yl)acetate (bdippza) ligands. Each ligand facially coordinates the zinc center via κ 3  N , N ', O coordination modes to form a distorted octa-hedral complex with four pyrazole N atoms in the basal plane and two carboxyl-ate O atoms in the axial sites.

Crystal structure of a homoleptic zinc(II) complex based on bis(3,5-diisopropylpyrazol-1-yl)acetate